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Two point light source located at a distance of 24 cm from each other. Between them, at a distance of 6 cm from one of them placed collecting lens. In this image both sources were obtained in the same spot. Find the focal length F of the lens.

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Task 40840. The solution formulas and the laws of recording used in the decision, drawing, calculation formula and the withdrawal response.
If you have any questions about the decision to write. I try to help.

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